Speaker
Patrick Janot
(CERN)
Description
With a centre-of-mass energy just above the top pair threshold production (√s ~ 365-370 GeV) and a luminosity of 1.8 10^34/cm2/s in up to four IPs, the FCC-ee can provide a measurement of the top quark to the photon and the Z with a precision below the per-cent level. This precision is reached with the sole angular and momentum distributions of the lepton arising from semi-leptonic decays in top anti-top events, and can be further improved with other observables. In a complementary manner, the FCC-hh, with Vs ~ 100 TeV and an integrated luminosity of several 1/ab, can measure the ratio of the ttH to the ttZ cross section to better than a per-cent. Together with the ttZ couplings and the Higgs decay branching ratios measured at the FCC-ee, the FCC can therefore provide a measurement of the ttH coupling with a precision below the per-cent.
These precisions allow the parameters of many Composite Higgs models to be critically explored. In this respect, as well as in many others, the combination of the FCC-ee and the FCC-hh provide the best search reach and the best precision of all projects on the market.
Author
Patrick Janot
(CERN)
Co-author
Alain Blondel
(Universite de Geneve (CH))
